package cn.daomeng.firebird.core.utils.encode;

/**
 * 简单Des加密算法实现<br/>
 * 通过encrypt(String key, byte[] src)方法加密一个字串
 * 通过 decrypt(String key, byte[] src)方法解密
 * 
 * @author yangw
 * @since 1.0.0
 */
public class DesCode {	

	static final int[] skb0 = {
            0x00000000, 0x00000010, 0x20000000, 0x20000010, 0x00010000,
            0x00010010, 0x20010000, 0x20010010, 0x00000800, 0x00000810,
            0x20000800, 0x20000810, 0x00010800, 0x00010810, 0x20010800,
            0x20010810, 0x00000020, 0x00000030, 0x20000020, 0x20000030,
            0x00010020, 0x00010030, 0x20010020, 0x20010030, 0x00000820,
            0x00000830, 0x20000820, 0x20000830, 0x00010820, 0x00010830,
            0x20010820, 0x20010830, 0x00080000, 0x00080010, 0x20080000,
            0x20080010, 0x00090000, 0x00090010, 0x20090000, 0x20090010,
            0x00080800, 0x00080810, 0x20080800, 0x20080810, 0x00090800,
            0x00090810, 0x20090800, 0x20090810, 0x00080020, 0x00080030,
            0x20080020, 0x20080030, 0x00090020, 0x00090030, 0x20090020,
            0x20090030, 0x00080820, 0x00080830, 0x20080820, 0x20080830,
            0x00090820, 0x00090830, 0x20090820, 0x20090830, };

    static final int[] skb1 = {
            0x00000000, 0x02000000, 0x00002000, 0x02002000, 0x00200000,
            0x02200000, 0x00202000, 0x02202000, 0x00000004, 0x02000004,
            0x00002004, 0x02002004, 0x00200004, 0x02200004, 0x00202004,
            0x02202004, 0x00000400, 0x02000400, 0x00002400, 0x02002400,
            0x00200400, 0x02200400, 0x00202400, 0x02202400, 0x00000404,
            0x02000404, 0x00002404, 0x02002404, 0x00200404, 0x02200404,
            0x00202404, 0x02202404, 0x10000000, 0x12000000, 0x10002000,
            0x12002000, 0x10200000, 0x12200000, 0x10202000, 0x12202000,
            0x10000004, 0x12000004, 0x10002004, 0x12002004, 0x10200004,
            0x12200004, 0x10202004, 0x12202004, 0x10000400, 0x12000400,
            0x10002400, 0x12002400, 0x10200400, 0x12200400, 0x10202400,
            0x12202400, 0x10000404, 0x12000404, 0x10002404, 0x12002404,
            0x10200404, 0x12200404, 0x10202404, 0x12202404, };

    static final int[] skb2 = {
            0x00000000, 0x00000001, 0x00040000, 0x00040001, 0x01000000,
            0x01000001, 0x01040000, 0x01040001, 0x00000002, 0x00000003,
            0x00040002, 0x00040003, 0x01000002, 0x01000003, 0x01040002,
            0x01040003, 0x00000200, 0x00000201, 0x00040200, 0x00040201,
            0x01000200, 0x01000201, 0x01040200, 0x01040201, 0x00000202,
            0x00000203, 0x00040202, 0x00040203, 0x01000202, 0x01000203,
            0x01040202, 0x01040203, 0x08000000, 0x08000001, 0x08040000,
            0x08040001, 0x09000000, 0x09000001, 0x09040000, 0x09040001,
            0x08000002, 0x08000003, 0x08040002, 0x08040003, 0x09000002,
            0x09000003, 0x09040002, 0x09040003, 0x08000200, 0x08000201,
            0x08040200, 0x08040201, 0x09000200, 0x09000201, 0x09040200,
            0x09040201, 0x08000202, 0x08000203, 0x08040202, 0x08040203,
            0x09000202, 0x09000203, 0x09040202, 0x09040203, };

    static final int[] skb3 = {
            0x00000000, 0x00100000, 0x00000100, 0x00100100, 0x00000008,
            0x00100008, 0x00000108, 0x00100108, 0x00001000, 0x00101000,
            0x00001100, 0x00101100, 0x00001008, 0x00101008, 0x00001108,
            0x00101108, 0x04000000, 0x04100000, 0x04000100, 0x04100100,
            0x04000008, 0x04100008, 0x04000108, 0x04100108, 0x04001000,
            0x04101000, 0x04001100, 0x04101100, 0x04001008, 0x04101008,
            0x04001108, 0x04101108, 0x00020000, 0x00120000, 0x00020100,
            0x00120100, 0x00020008, 0x00120008, 0x00020108, 0x00120108,
            0x00021000, 0x00121000, 0x00021100, 0x00121100, 0x00021008,
            0x00121008, 0x00021108, 0x00121108, 0x04020000, 0x04120000,
            0x04020100, 0x04120100, 0x04020008, 0x04120008, 0x04020108,
            0x04120108, 0x04021000, 0x04121000, 0x04021100, 0x04121100,
            0x04021008, 0x04121008, 0x04021108, 0x04121108, };

    static final int[] skb4 = {
            0x00000000, 0x10000000, 0x00010000, 0x10010000, 0x00000004,
            0x10000004, 0x00010004, 0x10010004, 0x20000000, 0x30000000,
            0x20010000, 0x30010000, 0x20000004, 0x30000004, 0x20010004,
            0x30010004, 0x00100000, 0x10100000, 0x00110000, 0x10110000,
            0x00100004, 0x10100004, 0x00110004, 0x10110004, 0x20100000,
            0x30100000, 0x20110000, 0x30110000, 0x20100004, 0x30100004,
            0x20110004, 0x30110004, 0x00001000, 0x10001000, 0x00011000,
            0x10011000, 0x00001004, 0x10001004, 0x00011004, 0x10011004,
            0x20001000, 0x30001000, 0x20011000, 0x30011000, 0x20001004,
            0x30001004, 0x20011004, 0x30011004, 0x00101000, 0x10101000,
            0x00111000, 0x10111000, 0x00101004, 0x10101004, 0x00111004,
            0x10111004, 0x20101000, 0x30101000, 0x20111000, 0x30111000,
            0x20101004, 0x30101004, 0x20111004, 0x30111004, };

    static final int[] skb5 = {
            0x00000000, 0x08000000, 0x00000008, 0x08000008, 0x00000400,
            0x08000400, 0x00000408, 0x08000408, 0x00020000, 0x08020000,
            0x00020008, 0x08020008, 0x00020400, 0x08020400, 0x00020408,
            0x08020408, 0x00000001, 0x08000001, 0x00000009, 0x08000009,
            0x00000401, 0x08000401, 0x00000409, 0x08000409, 0x00020001,
            0x08020001, 0x00020009, 0x08020009, 0x00020401, 0x08020401,
            0x00020409, 0x08020409, 0x02000000, 0x0A000000, 0x02000008,
            0x0A000008, 0x02000400, 0x0A000400, 0x02000408, 0x0A000408,
            0x02020000, 0x0A020000, 0x02020008, 0x0A020008, 0x02020400,
            0x0A020400, 0x02020408, 0x0A020408, 0x02000001, 0x0A000001,
            0x02000009, 0x0A000009, 0x02000401, 0x0A000401, 0x02000409,
            0x0A000409, 0x02020001, 0x0A020001, 0x02020009, 0x0A020009,
            0x02020401, 0x0A020401, 0x02020409, 0x0A020409, };

    static final int[] skb6 = {
            0x00000000, 0x00000100, 0x00080000, 0x00080100, 0x01000000,
            0x01000100, 0x01080000, 0x01080100, 0x00000010, 0x00000110,
            0x00080010, 0x00080110, 0x01000010, 0x01000110, 0x01080010,
            0x01080110, 0x00200000, 0x00200100, 0x00280000, 0x00280100,
            0x01200000, 0x01200100, 0x01280000, 0x01280100, 0x00200010,
            0x00200110, 0x00280010, 0x00280110, 0x01200010, 0x01200110,
            0x01280010, 0x01280110, 0x00000200, 0x00000300, 0x00080200,
            0x00080300, 0x01000200, 0x01000300, 0x01080200, 0x01080300,
            0x00000210, 0x00000310, 0x00080210, 0x00080310, 0x01000210,
            0x01000310, 0x01080210, 0x01080310, 0x00200200, 0x00200300,
            0x00280200, 0x00280300, 0x01200200, 0x01200300, 0x01280200,
            0x01280300, 0x00200210, 0x00200310, 0x00280210, 0x00280310,
            0x01200210, 0x01200310, 0x01280210, 0x01280310, };

    static final int[] skb7 = {
            0x00000000, 0x04000000, 0x00040000, 0x04040000, 0x00000002,
            0x04000002, 0x00040002, 0x04040002, 0x00002000, 0x04002000,
            0x00042000, 0x04042000, 0x00002002, 0x04002002, 0x00042002,
            0x04042002, 0x00000020, 0x04000020, 0x00040020, 0x04040020,
            0x00000022, 0x04000022, 0x00040022, 0x04040022, 0x00002020,
            0x04002020, 0x00042020, 0x04042020, 0x00002022, 0x04002022,
            0x00042022, 0x04042022, 0x00000800, 0x04000800, 0x00040800,
            0x04040800, 0x00000802, 0x04000802, 0x00040802, 0x04040802,
            0x00002800, 0x04002800, 0x00042800, 0x04042800, 0x00002802,
            0x04002802, 0x00042802, 0x04042802, 0x00000820, 0x04000820,
            0x00040820, 0x04040820, 0x00000822, 0x04000822, 0x00040822,
            0x04040822, 0x00002820, 0x04002820, 0x00042820, 0x04042820,
            0x00002822, 0x04002822, 0x00042822, 0x04042822, };

    // The key round shifts
    static final boolean[] shifts2 = { false, false, true, true, true, true,
            true, true, false, true, true, true, true, true, true, false };

    static final int[] SP0 = { 0x00410100, 0x00010000, 0x40400000, 0x40410100,
            0x00400000, 0x40010100, 0x40010000, 0x40400000, 0x40010100,
            0x00410100, 0x00410000, 0x40000100, 0x40400100, 0x00400000,
            0x00000000, 0x40010000, 0x00010000, 0x40000000, 0x00400100,
            0x00010100, 0x40410100, 0x00410000, 0x40000100, 0x00400100,
            0x40000000, 0x00000100, 0x00010100, 0x40410000, 0x00000100,
            0x40400100, 0x40410000, 0x00000000, 0x00000000, 0x40410100,
            0x00400100, 0x40010000, 0x00410100, 0x00010000, 0x40000100,
            0x00400100, 0x40410000, 0x00000100, 0x00010100, 0x40400000,
            0x40010100, 0x40000000, 0x40400000, 0x00410000, 0x40410100,
            0x00010100, 0x00410000, 0x40400100, 0x00400000, 0x40000100,
            0x40010000, 0x00000000, 0x00010000, 0x00400000, 0x40400100,
            0x00410100, 0x40000000, 0x40410000, 0x00000100, 0x40010100, };

    static final int[] SP1 = { 0x08021002, 0x00000000, 0x00021000, 0x08020000,
            0x08000002, 0x00001002, 0x08001000, 0x00021000, 0x00001000,
            0x08020002, 0x00000002, 0x08001000, 0x00020002, 0x08021000,
            0x08020000, 0x00000002, 0x00020000, 0x08001002, 0x08020002,
            0x00001000, 0x00021002, 0x08000000, 0x00000000, 0x00020002,
            0x08001002, 0x00021002, 0x08021000, 0x08000002, 0x08000000,
            0x00020000, 0x00001002, 0x08021002, 0x00020002, 0x08021000,
            0x08001000, 0x00021002, 0x08021002, 0x00020002, 0x08000002,
            0x00000000, 0x08000000, 0x00001002, 0x00020000, 0x08020002,
            0x00001000, 0x08000000, 0x00021002, 0x08001002, 0x08021000,
            0x00001000, 0x00000000, 0x08000002, 0x00000002, 0x08021002,
            0x00021000, 0x08020000, 0x08020002, 0x00020000, 0x00001002,
            0x08001000, 0x08001002, 0x00000002, 0x08020000, 0x00021000, };

    static final int[] SP2 = { 0x20800000, 0x00808020, 0x00000020, 0x20800020,
            0x20008000, 0x00800000, 0x20800020, 0x00008020, 0x00800020,
            0x00008000, 0x00808000, 0x20000000, 0x20808020, 0x20000020,
            0x20000000, 0x20808000, 0x00000000, 0x20008000, 0x00808020,
            0x00000020, 0x20000020, 0x20808020, 0x00008000, 0x20800000,
            0x20808000, 0x00800020, 0x20008020, 0x00808000, 0x00008020,
            0x00000000, 0x00800000, 0x20008020, 0x00808020, 0x00000020,
            0x20000000, 0x00008000, 0x20000020, 0x20008000, 0x00808000,
            0x20800020, 0x00000000, 0x00808020, 0x00008020, 0x20808000,
            0x20008000, 0x00800000, 0x20808020, 0x20000000, 0x20008020,
            0x20800000, 0x00800000, 0x20808020, 0x00008000, 0x00800020,
            0x20800020, 0x00008020, 0x00800020, 0x00000000, 0x20808000,
            0x20000020, 0x20800000, 0x20008020, 0x00000020, 0x00808000, };

    static final int[] SP3 = { 0x00080201, 0x02000200, 0x00000001, 0x02080201,
            0x00000000, 0x02080000, 0x02000201, 0x00080001, 0x02080200,
            0x02000001, 0x02000000, 0x00000201, 0x02000001, 0x00080201,
            0x00080000, 0x02000000, 0x02080001, 0x00080200, 0x00000200,
            0x00000001, 0x00080200, 0x02000201, 0x02080000, 0x00000200,
            0x00000201, 0x00000000, 0x00080001, 0x02080200, 0x02000200,
            0x02080001, 0x02080201, 0x00080000, 0x02080001, 0x00000201,
            0x00080000, 0x02000001, 0x00080200, 0x02000200, 0x00000001,
            0x02080000, 0x02000201, 0x00000000, 0x00000200, 0x00080001,
            0x00000000, 0x02080001, 0x02080200, 0x00000200, 0x02000000,
            0x02080201, 0x00080201, 0x00080000, 0x02080201, 0x00000001,
            0x02000200, 0x00080201, 0x00080001, 0x00080200, 0x02080000,
            0x02000201, 0x00000201, 0x02000000, 0x02000001, 0x02080200, };

    static final int[] SP4 = { 0x01000000, 0x00002000, 0x00000080, 0x01002084,
            0x01002004, 0x01000080, 0x00002084, 0x01002000, 0x00002000,
            0x00000004, 0x01000004, 0x00002080, 0x01000084, 0x01002004,
            0x01002080, 0x00000000, 0x00002080, 0x01000000, 0x00002004,
            0x00000084, 0x01000080, 0x00002084, 0x00000000, 0x01000004,
            0x00000004, 0x01000084, 0x01002084, 0x00002004, 0x01002000,
            0x00000080, 0x00000084, 0x01002080, 0x01002080, 0x01000084,
            0x00002004, 0x01002000, 0x00002000, 0x00000004, 0x01000004,
            0x01000080, 0x01000000, 0x00002080, 0x01002084, 0x00000000,
            0x00002084, 0x01000000, 0x00000080, 0x00002004, 0x01000084,
            0x00000080, 0x00000000, 0x01002084, 0x01002004, 0x01002080,
            0x00000084, 0x00002000, 0x00002080, 0x01002004, 0x01000080,
            0x00000084, 0x00000004, 0x00002084, 0x01002000, 0x01000004, };

    static final int[] SP5 = { 0x10000008, 0x00040008, 0x00000000, 0x10040400,
            0x00040008, 0x00000400, 0x10000408, 0x00040000, 0x00000408,
            0x10040408, 0x00040400, 0x10000000, 0x10000400, 0x10000008,
            0x10040000, 0x00040408, 0x00040000, 0x10000408, 0x10040008,
            0x00000000, 0x00000400, 0x00000008, 0x10040400, 0x10040008,
            0x10040408, 0x10040000, 0x10000000, 0x00000408, 0x00000008,
            0x00040400, 0x00040408, 0x10000400, 0x00000408, 0x10000000,
            0x10000400, 0x00040408, 0x10040400, 0x00040008, 0x00000000,
            0x10000400, 0x10000000, 0x00000400, 0x10040008, 0x00040000,
            0x00040008, 0x10040408, 0x00040400, 0x00000008, 0x10040408,
            0x00040400, 0x00040000, 0x10000408, 0x10000008, 0x10040000,
            0x00040408, 0x00000000, 0x00000400, 0x10000008, 0x10000408,
            0x10040400, 0x10040000, 0x00000408, 0x00000008, 0x10040008, };

    static final int[] SP6 = { 0x00000800, 0x00000040, 0x00200040, 0x80200000,
            0x80200840, 0x80000800, 0x00000840, 0x00000000, 0x00200000,
            0x80200040, 0x80000040, 0x00200800, 0x80000000, 0x00200840,
            0x00200800, 0x80000040, 0x80200040, 0x00000800, 0x80000800,
            0x80200840, 0x00000000, 0x00200040, 0x80200000, 0x00000840,
            0x80200800, 0x80000840, 0x00200840, 0x80000000, 0x80000840,
            0x80200800, 0x00000040, 0x00200000, 0x80000840, 0x00200800,
            0x80200800, 0x80000040, 0x00000800, 0x00000040, 0x00200000,
            0x80200800, 0x80200040, 0x80000840, 0x00000840, 0x00000000,
            0x00000040, 0x80200000, 0x80000000, 0x00200040, 0x00000000,
            0x80200040, 0x00200040, 0x00000840, 0x80000040, 0x00000800,
            0x80200840, 0x00200000, 0x00200840, 0x80000000, 0x80000800,
            0x80200840, 0x80200000, 0x00200840, 0x00200800, 0x80000800, };

    static final int[] SP7 = { 0x04100010, 0x04104000, 0x00004010, 0x00000000,
            0x04004000, 0x00100010, 0x04100000, 0x04104010, 0x00000010,
            0x04000000, 0x00104000, 0x00004010, 0x00104010, 0x04004010,
            0x04000010, 0x04100000, 0x00004000, 0x00104010, 0x00100010,
            0x04004000, 0x04104010, 0x04000010, 0x00000000, 0x00104000,
            0x04000000, 0x00100000, 0x04004010, 0x04100010, 0x00100000,
            0x00004000, 0x04104000, 0x00000010, 0x00100000, 0x00004000,
            0x04000010, 0x04104010, 0x00004010, 0x04000000, 0x00000000,
            0x00104000, 0x04100010, 0x04004010, 0x04004000, 0x00100010,
            0x04104000, 0x00000010, 0x00100010, 0x04004000, 0x04104010,
            0x00100000, 0x04100000, 0x04000010, 0x00104000, 0x00004010,
            0x04004010, 0x04100000, 0x00000010, 0x04104000, 0x00104010,
            0x00000000, 0x04000000, 0x04100010, 0x00004000, 0x00104010, };

    public static final boolean ENCRYPTION = true;

    public static final boolean DECRYPTION = false;

    public DesCode() {}

    private byte[] ecb(int[] ks, byte[] input, boolean mode)

    {

        int left, right; 
        int t, u;
        int[] tmp = new int[2];
        byte[] output = new byte[8];

        left = ((int) input[0] & 0xff) | (((int) input[1] & 0xff) << 8)
                | (((int) input[2] & 0xff) << 16)
                | (((int) input[3] & 0xff) << 24);

        right = ((int) input[4] & 0xff) | (((int) input[5] & 0xff) << 8)
                | (((int) input[6] & 0xff) << 16)
                | (((int) input[7] & 0xff) << 24);

        tmp = iperm(left, right);
        left = tmp[0];
        right = tmp[1];

        if (mode) {
            for (int i = 0; i < 32; i += 4) {
                t = ((right << 1) | (right >>> 31)) & 0xffffffff;
                u = t ^ ks[i];
                t = t ^ ks[i + 1];
                t = ((t >>> 4) | (t << 28)) & 0xffffffff;
                left ^= SP1[t & 0x3f] | SP3[(t >>> 8) & 0x3f]
                        | SP5[(t >>> 16) & 0x3f] | SP7[(t >>> 24) & 0x3f]
                        | SP0[u & 0x3f] | SP2[(u >>> 8) & 0x3f]
                        | SP4[(u >>> 16) & 0x3f] | SP6[(u >>> 24) & 0x3f];

                t = ((left << 1) | (left >>> 31)) & 0xffffffff;
                u = t ^ ks[i + 2];
                t = t ^ ks[i + 3];
                t = ((t >>> 4) | (t << 28)) & 0xffffffff;
                right ^= SP1[t & 0x3f] | SP3[(t >>> 8) & 0x3f]
                        | SP5[(t >>> 16) & 0x3f] | SP7[(t >>> 24) & 0x3f]
                        | SP0[u & 0x3f] | SP2[(u >>> 8) & 0x3f]
                        | SP4[(u >>> 16) & 0x3f] | SP6[(u >>> 24) & 0x3f];
            }
        } 

        else {
            for (int i = 30; i > 0; i -= 4) {
                t = ((right << 1) | (right >>> 31)) & 0xffffffff;
                u = t ^ ks[i];
                t = t ^ ks[i + 1];
                t = ((t >>> 4) | (t << 28)) & 0xffffffff;
                left ^= SP1[t & 0x3f] | SP3[(t >>> 8) & 0x3f]
                        | SP5[(t >>> 16) & 0x3f] | SP7[(t >>> 24) & 0x3f]
                        | SP0[u & 0x3f] | SP2[(u >>> 8) & 0x3f]
                        | SP4[(u >>> 16) & 0x3f] | SP6[(u >>> 24) & 0x3f];

                t = ((left << 1) | (left >>> 31)) & 0xffffffff;
                u = t ^ ks[i - 2];
                t = t ^ ks[i - 1];
                t = ((t >>> 4) | (t << 28)) & 0xffffffff;
                right ^= SP1[t & 0x3f] | SP3[(t >>> 8) & 0x3f]
                        | SP5[(t >>> 16) & 0x3f] | SP7[(t >>> 24) & 0x3f]
                        | SP0[u & 0x3f] | SP2[(u >>> 8) & 0x3f]
                        | SP4[(u >>> 16) & 0x3f] | SP6[(u >>> 24) & 0x3f];
            }
        }
        
        tmp = fperm(left, right);
        left = tmp[0];
        right = tmp[1];

        output[0] = (byte) (left & 0xff);
        output[1] = (byte) (left >>> 8);
        output[2] = (byte) (left >>> 16);
        output[3] = (byte) (left >>> 24);
        output[4] = (byte) (right & 0xff);
        output[5] = (byte) (right >> 8);
        output[6] = (byte) (right >> 16);
        output[7] = (byte) (right >> 24);

        return output;

    }

    private int[] fperm(int left, int right){
        int t;
        int[] out = new int[2];

        t = ((right >>> 1) ^ left) & 0x55555555;
        right ^= (t << 1);
        left ^= t;
        t = ((left >>> 8) ^ right) & 0x00ff00ff;
        left ^= (t << 8);
        right ^= t;
        t = ((right >>> 2) ^ left) & 0x33333333;
        right ^= (t << 2);
        left ^= t;
        t = ((left >> 16) ^ right) & 0x0000ffff;
        left ^= (t << 16);
        right ^= t;
        t = ((right >>> 4) ^ left) & 0x0f0f0f0f;
        right ^= (t << 4);
        left ^= t;
        left &= 0xffffffff;
        right &= 0xffffffff;

        out[0] = left;
        out[1] = right;

        return out;
    }

    private int[] iperm(int left, int right){
        int t;
        int[] out = new int[2];

        t = ((right >>> 4) ^ left) & 0x0f0f0f0f;
        right ^= (t << 4);
        left ^= t;
        t = ((left >>> 16) ^ right) & 0x0000ffff;
        left ^= (t << 16);
        right ^= t;
        t = ((right >>> 2) ^ left) & 0x33333333;
        right ^= (t << 2);
        left ^= t;
        t = ((left >>> 8) ^ right) & 0x00ff00ff;
        left ^= (t << 8);
        right ^= t;
        t = ((right >>> 1) ^ left) & 0x55555555;
        right ^= (t << 1);
        left ^= t;
        t = left;
        left = right & 0xffffffff;
        right = t & 0xffffffff;

        out[0] = left;
        out[1] = right;

        return out;
    }

    /**
     * 加密一个字串
     */
    public byte[] encrypt(String key, byte[] src) {
        byte[] keyBuf = new byte[8];

        int keyLen = key.length();
        if (keyLen > 8)
            keyLen = 8;

        System.arraycopy(key.getBytes(), 0, keyBuf, 0, keyLen);

        int length = src.length;

        byte[] srcBuf;

        if ((length % 8) > 0) {
            int len = length;
            length = 8 * (length / 8) + 8;
            srcBuf = new byte[length];
            System.arraycopy(src, 0, srcBuf, 0, len);
            for (int i = len; i < length; i++)
                srcBuf[i] = (byte) 0x20;
        } else
            srcBuf = src;

        return processByteArray(keyBuf, srcBuf, DesCode.ENCRYPTION);

    }

    /**
     * 进行解密处理
     */
    public byte[] decrypt(String key, byte[] src) {
        byte[] keyBuf = new byte[8];

        int keyLen = key.length();
        if (keyLen > 8)
            keyLen = 8;

        System.arraycopy(key.getBytes(), 0, keyBuf, 0, keyLen);

        byte[] decBuf = processByteArray(keyBuf, src, DesCode.DECRYPTION);

        int length = decBuf.length;

        int len = length;
        int count = 0;
        while (decBuf[len - 1] == 0x20) {
            count++;
            len--;
            if (len == 0)
                break;
        }

        if (count > 0) //trim the padding ' '
        {
            byte[] tmp = new byte[length - count];
            System.arraycopy(decBuf, 0, tmp, 0, length - count);
            return tmp;
        } else
            return decBuf;

    }

    private byte[] processByteArray(byte[] key, byte[] input, boolean mode) {
        int[] ks = new int[32];

        byte[] in_block = new byte[8];
        byte[] out_block = new byte[8];
        byte[] output = new byte[input.length];

        ks = set_key(key);

        for (int i = 0, j = input.length / 8; i < j; i++) {
            System.arraycopy(input, 8 * i, in_block, 0, 8);
            out_block = ecb(ks, in_block, mode);
            System.arraycopy(out_block, 0, output, 8 * i, 8);
        }
        return output;
    }

    private int[] set_key(byte[] key) {
        int ks[] = new int[32];
        int c, d, s, t;

        c = ((int) key[0] & 0xff) | (((int) key[1] & 0xff) << 8)
                | (((int) key[2] & 0xff) << 16) | (((int) key[3] & 0xff) << 24);

        d = ((int) key[4] & 0xff) | (((int) key[5] & 0xff) << 8)
                | (((int) key[6] & 0xff) << 16) | (((int) key[7] & 0xff) << 24);

        t = ((d >> 4) ^ c) & 0x0f0f0f0f;
        d ^= (t << 4);
        c ^= t;

        t = ((c << 18) ^ c) & 0xcccc0000;
        c = c ^ t ^ (t >>> 18);
        t = ((c << 17) ^ c) & 0xaaaa0000;
        c = c ^ t ^ (t >>> 17);
        t = ((c << 8) ^ c) & 0x00ff0000;
        c = c ^ t ^ (t >>> 8);
        t = ((c << 17) ^ c) & 0xaaaa0000;
        c = c ^ t ^ (t >>> 17);

        t = ((d << 24) ^ d) & 0xff000000;
        d = d ^ t ^ (t >>> 24);
        t = ((d << 8) ^ d) & 0x00ff0000;
        d = d ^ t ^ (t >>> 8);
        t = ((d << 14) ^ d) & 0x33330000;
        d = d ^ t ^ (t >>> 14);
        d = ((d & 0x00aa00aa) << 7) | ((d & 0x55005500) >>> 7)
                | (d & 0xaa55aa55);
        d = (d >>> 8) | ((c & 0xf0000000) >>> 4);
        c &= 0x0fffffff;

        for (int i = 0; i < 16; i++) {
            if (shifts2[i]) {
                c = (c >>> 2) | (c << 26);
                d = (d >>> 2) | (d << 26);
            } else {
                c = (c >>> 1) | (c << 27);
                d = (d >>> 1) | (d << 27);
            }

            c &= 0x0fffffff;
            d &= 0x0fffffff;

            s = skb0[c & 0x3f]
                    | skb1[(((c >>> 6) & 0x03) | ((c >>> 7) & 0x3c))]
                    | skb2[(((c >>> 13) & 0x0f) | ((c >>> 14) & 0x30))]
                    | skb3[(((c >>> 20) & 0x01) | ((c >>> 21) & 0x06) | ((c >>> 22) & 0x38))];

            t = skb4[(d & 0x3f)]
                    | skb5[(((d >>> 7) & 0x03) | ((d >>> 8) & 0x3c))]
                    | skb6[((d >>> 15) & 0x3f)]
                    | skb7[(((d >>> 21) & 0x0f) | ((d >>> 22) & 0x30))];

            ks[2 * i] = ((t << 16) | (s & 0x0000ffff)) & 0xffffffff;
            s = (s >>> 16) | (t & 0xffff0000);
            ks[2 * i + 1] = ((s << 4) | (s >>> 28)) & 0xffffffff;

        }

        return ks;
    }

    protected static String strPadding(String in) {
        int t = in.length() % 8;
        if (t == 0)
            return in;
        else {
            StringBuffer buf = new StringBuffer(in);
            for (int i = 0; i < ((8 - t) % 8); i++)
                buf.append(" ");
            return buf.toString();
        }
    }
}
